John s



(No Model.)

J. S. P-ESSENGER.

HYDRAULIGSTAMPING PRESS. No. 330,730. Patented Nov. 1.7, 1885.

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JOHN S. PES SENGER, OF BROOKLYN, NEW YORK.

HYDRAULIC STAMPING-PRESS.

SPECIFICATION forming part of Letters Patent No. 330,730, dated November 17, 1885.

Application filed June 27, 1885. Serial No. 169,955. (No model.)

To aZZ whom it may concern:

Be it known that I, JOHN S. PESSENGER, a citizen of the United States, residing at Brooklyn, in the county of Kings and'State of New York, have invented new and useful Improvements in Hydraulic Stamping Presses, of which the following is a specification.

lVIy invention consists of an improved contrivance of hydraulic stamping mechanism for forming sheet-metal ware, the essential feature of which is a ram for presenting the blank to and holding it on the face of the intaglio-die governed by hydraulic pressure, adapted to hold and release the sheet for drawing into the die without buckling, in combination with the cameo-die attached toaram governed by other hydraulic pressure independent of that which operates the holder, and adapted to effect the stamping without effect on or interference with the holder, and being arranged so as to dispense with special means for returning the rains.

My invention also comprises certain details of the apparatus, all as hereinafter fully described, reference being made to the accom panying drawings, in which Figure l is a plan view of the base of the machine containing the cylinders and rams; and Fig. 2 is a sectional elevation of the complete machine, taken on the line no a: of Fig. 1.

I make a substantial vertical cylinder, a, the bore of which is of smaller diameter in the lower part, b, and contains a ram, 0, which works through the bore of the ramd, which ram works in the upper and larger part, e, of the bore of cylinder a, both being suitably packed for preventing the escape of the fluid, as at f and g, and each part of the cylinder having independent inlet-pipes h i, respectively connected with separate accumulators or other forcing apparatus of different tensions. Over the ram d, I mount the intaglio-die j in a recess, 70, in the lower side of the head Z of the press, against which the holding-ram d, having the blank to be stamped,is to be pressed, preparatory to being stamped,by the fluid admitted through pipe-z, and forced by pressure predetermined in respect of its force for holding the blank with the requisite tension for allowing it to draw firmly when acted on by the cameo-die m. The die m is then forced up with greater pressure of liquid from another source through pipe h to effect the stamping. By these contrivances of separate motive liquids for the different rams it will be seen that the different forces required for the different rams can be gaged independently for them, and each can be varied separately, according as it may be required for sizes and kinds of articles to be made and as the dies are varied, the dies being interchangeable.

The die j is fitted detachably in the recess k,where it is held by the screws a,which screw into and out of the recesses in the sides of the die, as shown in Fig. 2, the screws being inserted in their places beforethe holding-down rods 0 are inserted.

The dies m are detachable'from the head of the ram 0, on which they rest and are retained by a center stud, 10, of the die, and a corresponding socket in the top of the ram.

The ram 01 has an annular recess in the top, which is fitted with a plain ring, q, when the die m is the same size as the ram; but when smaller dies are substituted I put in other rings fitted to limit the bore out of which the die issues to the size of the die.

The cylinder is strongly flanged on opposite sides to provide the supporting-plates s for the foot-rests of the standards t of the head Z, which are bolted to said flanges and also secured by the rods 0, and the flanges are reenforced by the radial stay-ribs u of the cylinder. The packing gis secured by the gland '11, of the usual form.

Above the die j, I provide a cork or other approved elastic cushion, w, for relieving the machine of the shocks that would otherwise be caused by admitting the fluid too quickly, which often occurs.

For allowing the rams to descend after each operation, the fiuid is allowed to escape from the pipes by any approved contrivance of cocks or valves adapted to cut off the communication with the accumulators and open an escape-passage.

In this example I have represented the arrangement as for working the rams vertically upward to apply the power, so that when the water escapes the rams will descend by their gravity,whichavoids the use of special means or contrivances for effecting the return of the rams and simplifies and cheapens the machine; but the press may be inverted 'or arranged at any angle preferred, and it may be employed .d, arranged in the enlarged section e of the for forging, swaging, and other kinds of presscylinder, the forming-ram 0, extending through work, as desired. the annularram d, and arrangedin the smaller 20 It is to be noted that in my arrangement of bore-section b of said cylinder, packing-joints 5 the rams the power applied. to the ram 0 does f g, and the separateiulet-pipes hi, constructnot react on the ram d, and thusinterfere with ed in the described arrangement,in which the its action, as would be the case if the cylinder power is applied to ram 0 independently of for the ram 0 were formed wholly within the ram d, and so as to force the rams upward in 25 ram d, said ram having its lower end closed taking effect and to enable them to descend by [0 and having a pipe-connection through it for gravity when the water escapes.

the water. In witness whereof I have hereunto signed Having thus described inyinvention, what I my name in the presence of two subscribing claim, and desire to secure by Letters Patent, witnesses. 1s-

r 5 In a hydraulic stamping-press, the combi- Witnesses:

nation of the cylinder a, having the differen- W. J. MORGAN, V tial bore-sections b e, the annular holding-ram HOWARD D. BURT.

JOHN S. PESSENGER. 

